Symptoms of mesothelioma many years clear. In other words, it has a long incubation period. This makes it hard to diagnose and treat. The person may repeat visit with the doctor the symptoms, but more often than respiratory infections. The nonspecific symptoms make it hard even for experienced physicians to a rapid and conclusive diagnosis with mesothelioma patients. Even people exposed to asbestos with the event starting late in life. By the time mesothelioma is detected, is already widespread. But, the awareness of people in the early stages of mesothelioma recognize.